GitLab

This switches all QUICHE container aliases to the appropriate type
of hash map, switches optional to absl::optional, and also changes
some of the macros.

Bug: 1128392
Change-Id: I47384d899c509170cd8d46208ee6a7eeac78d59b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416945Reviewed-by: David Schinazi <dschinazi@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Victor Vasiliev <vasilvv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808332}